openPMD I/O: fix parallel flushing #540
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This introduces a workaround for a parallel flushing bug in openPMD-api <= v0.15, see openPMD/openPMD-api#1616 for the original issue and openPMD/openPMD-api#1616 for the fix.
A fixed version is not yet released but it will be v0.16.
tldr version: explicitly write some Iteration attribute (here:
dt) again to mark the Iteration as dirty so that the flushing logic will not accidentally skip it for collective flush operations.